在iphone编程中寻找时间

我需要找到我的iphone应用程序的当前时间。我需要把它分解成不同的单位，所以我需要不同变量中的小时、分钟和秒。请帮忙

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"HH"];
int hour = [[dateFormatter stringFromDate:[NSDate date]] intValue];
[dateFormatter setDateFormat:@"mm"];
int minute = [[dateFormatter stringFromDate:[NSDate date]] intValue];
[dateFormatter setDateFormat:@"ss"];
int second = [[dateFormatter stringFromDate:[NSDate date]] intValue];
[dateFormatter release];

23:34:6

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这是可行的，但是

NSCalendar

和

NSDateComponents

是可行的。您也可以格式化“HHmmss”或类似的格式，然后再格式化子字符串。NSDateComponents有点笨拙，因为您必须先创建日历。

NSDate *date = [NSDate date];
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:date];

NSInteger year = [dateComponents year];
NSInteger month = [dateComponents month];
NSInteger day = [dateComponents day];
NSInteger hour = [dateComponents hour];
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];

[calendar release];

NSDate           *date           = [NSDate date];
NSCalendar       *calendar       = [NSCalendar currentCalendar];
NSCalendarUnit    unitFlags      = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:date];

NSInteger hour   = [dateComponents hour];
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];

NSLog(@"%ld:%ld:%ld", hour, minute, second);